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核级316LN不锈钢焊接接头的组织结构变化

李兆登, 崔振东, 王维珍, 尹建华

李兆登, 崔振东, 王维珍, 尹建华. 核级316LN不锈钢焊接接头的组织结构变化[J]. 焊接学报, 2019, 40(8): 89-95. DOI: 10.12073/j.hjxb.2019400214
引用本文: 李兆登, 崔振东, 王维珍, 尹建华. 核级316LN不锈钢焊接接头的组织结构变化[J]. 焊接学报, 2019, 40(8): 89-95. DOI: 10.12073/j.hjxb.2019400214
shu
LI Zhaodeng, CUI Zhendong, WANG Weizhen, YIN Jianhua. Microstructure of nuclear grade 316LN stainless steel welded joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(8): 89-95. DOI: 10.12073/j.hjxb.2019400214
Citation: LI Zhaodeng, CUI Zhendong, WANG Weizhen, YIN Jianhua. Microstructure of nuclear grade 316LN stainless steel welded joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(8): 89-95. DOI: 10.12073/j.hjxb.2019400214
shu

核级316LN不锈钢焊接接头的组织结构变化

  • 自然资源部天津海水淡化与综合利用研究所, 天津 300192

基金项目: 中央级公益性科研院所基本科研业务费专项资金项目（K-JBYWF-2016-G4，K-JBYWF-2017-T04）

Microstructure of nuclear grade 316LN stainless steel welded joint

  • The Institute of Seawater Desalination and Multipurpose Utilization, MNR(Tianjin), Tianjin 300192, China

摘要

    摘要
  • 摘要: 通过光学显微镜、扫描电镜、透射电镜、电子背散射衍射、X射线衍射仪和硬度测量仪等方法对核级316LN焊接接头不同区域的组织结构进行了系统研究，结果表明，焊缝区冷却凝固模式以铁素体-奥氏体（F-A）为主，残留的铁素体以蠕虫状或板条状形式存在奥氏体基体上，含量约为13.66%.熔合区宽度不统一，凝固模式以奥氏体-铁素体（A-F）为主，并且具有明显的外延生长趋势；热影响区发生不同程度的再结晶、晶粒长大和变形行为，Σ3晶界比例降低，而硬度和残余应力增大.
    Abstract: Optical microscope, scanning electron microscope, transmission electron microscope, electron back scattering diffraction, X-ray diffraction and hardness measurement were used to investigate the microstructure of the different zones in nuclear grade 316LN welded joints. The results show that, the solidfication type of weld zone was dominated by ferrite-austenite(F-A) mode, and the content of vermicular-or lath-like residual ferrite existed in the austenite matrix was 13.66%. The fusion zone solidficated in the form of austenite-ferrite(A-F) mode, and the width of which was not uniform. Moreover, the fusion zone exhibited the epitaxial growth tendency. Recrystallization, grain growth and deformation behavior with different degrees occurred in the heat-affected zone. Meanwhile, less Σ3 grain boundary, high hardness and residual stress were found in the heat-affected zone.
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    • 参考文献(18)
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  • 收稿日期:  2018-11-13

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